I have a 62 (cd19s) Johnson outboard. I replaced the fuel pump, the water pump and rebuilt the carb. Have had it on the water a few times and it runs like a top. Noticed gearcase oil coming from the water intake screen and a very slow drip from the exhaust after the motor was used. Unscrewed the greacase filler and found about 2 oz of water in the gearcase. No metal pieces and the oil was not milky. Sounds like the drive shaft seal or the shift rod seal is leaking. Can I replace these seals from the top (under the water pump) or do I have to break the gearcase and rebuild the whole unit? Can I replace the gear oil with Lubriplate 105 for the rest of the season to postpone the rebuild until this winter? Any help would be appreciated.